package sring;

public class StringBuilderDemo {
    public static void main(String[] args) {
        String sta="好好学习java";
        StringBuilder builder=new StringBuilder(sta);
        builder.append(",为了不上班");
        System.out.println(builder);
        builder.replace(9,16,"开台子割韭菜");
        System.out.println(builder);
        builder.insert(9,"狠狠地");
        System.out.println(builder);
        builder.delete(0,8);
        System.out.println(builder);












//        String str="好好学习java";
//        StringBuilder builder=new StringBuilder(str);
//        builder.append(",为了找个好工作");
//        System.out.println(builder);
//        builder.replace(9,16,"为了开台子");
//        System.out.println(builder);
//        builder.insert(9,"哈哈哈");
//        System.out.println(builder);
//        builder.delete(0,8);
//        System.out.println(builder);































//        StringBuilder builder1=new StringBuilder();
//        StringBuilder builder2=new StringBuilder("abc");
//        String str="abc";
//        StringBuilder builder3=new StringBuilder(str);
//        String str2=builder3.toString();
//        String str3="好好学习java";
//        StringBuilder builder=new StringBuilder(str3);
//        builder.append("为了找到好工作");//追加内容在末尾
//        System.out.println(builder);
//        builder.replace(9,16,"就是为了改变世界");//替换部分内容（含头不含尾）
//        System.out.println(builder);
//        builder.delete(0,9);//删除下标为0到7的
//        System.out.println(builder);
//        builder.insert(0,"活着");//插入内容
//        System.out.println(builder);
    }
}
